Screen cleaner



L. C. PHARO March 16 1926.

SCREEN CLEANER Filed Sept. 19, 1925 INvE-NTonz Lee COLLIN PHARo Patented Mar. 16, 1926.

LEE COLLIN PHRO, OF THETFORD MNES,

QUEBEC, CANADA, ASSE-:SNOB T ASBESTOS CORPORATION OF CANADA, LIIVTED, F lM OL\T'L RIEL\L, CANADA, A CORCRATIGN.

SCREEN CLEANER.

, i Application led September To all 107mm 'it may concern.'

Be it known `that I, Lun COLLIN P1-nino, a subject ot the `King ot Great Britain, and resident of '.hetiord Mines, Province ,ot Quebec7 Cainida, have invented certain new Aand useful improvements in Screen Cleaners, and do lhereby declare `that the following is a full, clear, and description 01' the same.

This invention relates to screening devices employing an yoscillatory screen and appertains particularly to an attachment for such screen ,wherebyv the llatter is eziposed -to vibratory impulses distinct 'from its oscillatory screening movement for the purpose ot dislodging accumulations in the meshes of the screen and preventing clogging or blinding thereof,

Heretofore it has been found that in screening a commodity of a fibrous nature such as asbestos, the screen is particularly subject to clogging or lblinding notwithstanding the agitation the screen receives as it is shaken during the screening operation, this agitation being an oscillatory movement in the plane ot thel screen surface. The object of this invention is to avoid ythis clogging 'of the screen by exposing vthe latter `to vibratory impulses directed perpendicularly to t-he piane ot' the screen whereby -pai-ticlestcnding to accumulate in vthe meshes are dislodged and the openings cleared for the free passage ot the screenings. i

Another object is the provision oi' an attachment fior the screen which will be automatically actuated by the screening` movements to impart the supplementary mesh clearing vibrations so that the clmtringhr action will be continuous lthroughout the screening action.

Another object is the provision et the particular combination and arrangement ot parts producing the supplemental vibration perpendicularly to the plane ot thescreen.

rlhe above with 'further objects and advantages will be hereinafter more Afully described in the following specification and particularly pointed out in the accompanying claims.

For 'full comprehension, however, of my invention reference should lbe had to the accompanying drawings ,forming a part et 19, 1925. -Seral No. 57,379.

this specification, in which the same retorence,l characters in'dicate`tlie-samc parts and wherein vFig. l is a perspective view ot a screen with the screen clearing vibratory attach- Vment applied g Fig. 2 is an end View oft the clearing attachment illustrating its operative connection with the screen; and i :Fig: y isa side v iew thereof. y

This invention has been developed especially in connection with the asbestos industry and in the drawings a shaking screen is shown, 2 indicating the wire cloth and 23 the sides and it will be apparent to those lwith a knowledge of the art, that the connecting rod et leads -to an ,eccentric drive e whereby the screen is oscilla-ted Eto and tro in the plane of the'iscreen surface to shake the asbestos and screen it.

This normal oscillation or shaking ot' the screen has proven inadequate to prevent clogging ot the wire and in order to prevent this clogging l have devised an attachment which.` will impart vibrations to the cloth peipendicularly vthereto and dislodge accumulations tending .to vclog the' mesh, this attachment .being actuated by the ndi'- m'al shaking oi the yscreen and functioning continuously during the sha-icing l operation.

The.attachmentconsists otfa. striker associated lwith the screen in such manner as to partake of movement independently ct the screen and by .means ot such independent movement impart vibrations to the screen in a plane .perpendicular to the screen 'surface and its oscillatory or shaking movements.

In the Vpreferred embodiment o't' the invention illustrated the striker cons1sts oi' a.

member 5 pivoted between its ends adjacent the screen 2 upon a pivot 6 substantially parallel to the screen and permitting 'tree oscillation or rocking ot' the member in a path perpendicular to the screen whereby atV the end'of each oscillation a vibrating stroke is imparted by the striker tothe screen per-pendicularly thereto.

In detail a cross-piece '7 extends transversely across the screen 2 being fastened at its' ends to the .sides S. About midway of this cross-piece an upwardly facing channel bracket 8 is bolted thereto, the sides of the bracket serving as bearings for the pivot pin 6 upon which the rocking striker 5 is mounted. rlhe striker is shown in the form or a metallic triangular Jtraine pivoted midway of its base upon pin G, this pin extend ingtransversely ot the screen and the etiker being thus in longitudinal line with he screen, it will oscillate freely under the action ot the shaking screen as it is moved longitudinally backwards and forwards by the eccentrically driven connecting rod.

Each end ot the striker 5 overhangs a bumper pin 9 t'astened at the bottom to the screen and extending upwardly to within a short distance of the striker in position to be struck thereby at the end ot an oscillation of the striker, the impulse being communicated to the screen in the torni et a perpendicular vibration.

ln order to secure the maximum etl'ectiveness ot the striker vibrations a metallic strip l is clamped upon the screen 2 by passing the bumper pins therethrough and through the screen and fastening the pins by the nuts Vll the strip vextending throughout the length oit the screen and conveying the vibrations along the length thereof. Clamps l2 in addition 'to the pins t?, intiinatcl),v associate the strip lO and the screen at points remote from said pins 9.

In the preferred construction the bumper pins extend loosely up through openings 13 in the cross-piece and the ends of the striker are provided with striker heads or bosses lat ttor Contact with the upper ends of the bumper pins.

Yi'uring the backward and forward oscillation of the screen the freely pivoted striker 5 automatically oscillates perpendicularly through its momentum at the end et' each backward and `forward movement ot the screen and at the end of each oscillation strikes one or' the bumper pins and vibrates the screen perpendicularly thus supplen';entingy the agitation of the asbestos being screened as the asbestos is exposed to two perpendicularly related impulses and is therefore more thoroughly shaken up than hereto-tore in addition to being relieved of the in'ipairment due to the screen clogging, the perpendicular vibrati-ims knocking the acciniiulations 'troni the wire mesh.

That l cla-ini is as follows:

l. The combina-tien with an oscillatory screen having means l'oi oscillating same in a longitudinal direction, ot a cross-piece carried by the screen trame transversely thereof and spaced from the upper surface ot the screen-cloth7 said cross-piece having vertical guiding apertures therethrough and carrying a bracket-piece apertured in line with the apertures in the cross-piece and acting as a support for a rocking striker; a steel strip extending longitudinally oli and secured to the upper surface or the screencloth; al pair ot bumper pins secured at their lower ends to said steel strip and pro` jecting upwardly through the guiding apertures in the cross-piece and bracket piece; a rocking striker formed o'f a flat metal strip bent into triangular form and pivoted centrally ot its base to said bracket-piece and in such relation to the bumper pins that upon oscillation of the screen the striker will be rocked and each pin alternately struck thereby.

The combination with an oscillatory screen having means tor oscillating same in a longitudinal directiont ot a cross-lriiece carried by the screen traine transversely thereoi" and spaced troni the upper surface of the screen-cloth7 said cross-piece having vertical guiding apertures therethrough and carrying a bracket-piece apertured in line with the apertures in the cross-piece and acting as a support for a rocking striker; a` steel strip extending longitudinally or and secured to the upper surface of the screen-cloth; a pair ol bun'iper pins secured at their lower ends to said steel strip and projecting up wardly through the guiding apertures in the cross-piece and bracket-piece; a rocking striker formed ot' a flat metal strip bent into triangular Ytorni, having striker heads projecting from the underside ot the base ot' saine, and pivoted centrally ot' such base to said bracket-piece and in such relation to the bumper pins that upon oscillation ot' the screen the striker will be rocked and each pin alternately struck by the striker heads.

In testimony whereof, have signed my name to this specification.

LEE COLLlN Plc-IARD.

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